Samlexpower SEC-1260A Owner's Manual page 8

DEPTH OF DISCHARGE AND BATTERY LIFE
The more deeply a battery is discharged on each cycle, the shorter the battery life. Using
more batteries than the minimum required will result in longer life for the battery bank. A
typical cycle life chart is given at Table 2 below:
Table 2. – Typical Cycle Life Chart
Depth of Discharge Cycle Life
% of AH Capacity Group 27 / 31
10 1000
50 320
80 200
100 150
It is recommended that the depth of discharge should be limited to 50 %
LOSS OF BATTERY CAPACITY AT LOW TEMPERATURES
Batteries lose capacity at low temperatures. At 32 º F, a battery will deliver about 70 to 80
% of its rated capacity at 80 º F. If the air temperature near the battery bank is lower than 80
º F, additional batteries will be needed to provide the same usable capacity. For very cold
climates, an insulated / heated battery compartment is recommended.
SERIES AND PARALLEL CONNECTION OF BATTERIES
Series Connection
Battery 1 Battery 2
+
6V 6V
When two or more batteries are connected in series, their voltages add up but their AH
capacity remains the same. Fig. 1 above shows 4 pieces of 6 V, 200 AH batteries connected
in series to form a battery bank of 24 V with a capacity of 200 AH. The positive terminal of
Battery 4 becomes the positive terminal of the 24 V bank. The negative terminal of Battery
4 is connected to the positive terminal of Battery 3. The negative terminal of Battery 3 is
connected to the positive terminal of Battery 2. The negative terminal of Battery 2 is
connected to the positive terminal of Battery 1. The negative terminal of Battery 1 becomes
the negative terminal of the 24 V battery bank.
Cycle Life
Group 8D
1500
480
300
225
Battery 3
Battery 4
+ + +
6V 6V
Fig 1. Series Connection
Page 7
Cycle Life
Group GC2
3800
1100
675
550
+
24V Charger